【C语言也能干大事】第五讲 组合框控件，下拉列表

获得组合框控件的句柄
HWND hwndCombo1 = GetDlgItem(hwnd, IDC_COMBO1);

确定目前选项的索引
int curSel = ComboBox_GetCurSel(hwndCombo1);

删除项
ComboBox_DeleteString(hwndCombo1, 2);

取得有多少项
int getCount = ComboBox_GetCount(hwndCombo1);
TCHAR getcount[256];
itoa(getCount, getcount, 10);
MessageBox(hwnd, getcount, TEXT("总计有多少项"), MB_OK);

选定某项的值
ComboBox_SetCurSel(hwndCombo1, 2);

得到某项的值
TCHAR str[256];
ComboBox_GetLBText(hwndCombo1, 1, str);
MessageBox(hwnd, str, TEXT("得到选项的值为"), MB_OK);

添加内容：
ComboBox_AddtString(hwndComboOp, TEXT("+"));
ComboBox_InsertString(hwndComboOp, -1, TEXT("+"));

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学生管理系统：

HWND hwndCombo1 = GetDlgItem(hwnd, IDC_COMBO1);switch(id){case IDC_ADD:{TCHAR str1[256];GetDlgItemText(hwnd, IDC_EDIT1, str1, sizeof(str1));ComboBox_AddString(hwndCombo1, str1);SetDlgItemText(hwnd, IDC_EDIT1, TEXT(""));}break;case IDC_DEL:{int curSel = ComboBox_GetCurSel(hwndCombo1);if (CB_ERR == curSel){MessageBox(hwnd, TEXT("没有任何项被选择"), TEXT("错误"), MB_OK | MB_ICONERROR);return ;}ComboBox_DeleteString(hwndCombo1, curSel);}break;case IDC_SER:{TCHAR str2[256];GetDlgItemText(hwnd, IDC_EDIT2, str2, sizeof(str2));int icount = ComboBox_GetCount(hwndCombo1);int i = 0;BOOL bFound = FALSE;for(i = 0; i < icount; i++){TCHAR str3[256];ComboBox_GetLBText(hwndCombo1, i, str3);if(lstrcmp(str2, str3) == 0){bFound = TRUE;ComboBox_SetCurSel(hwndCombo1, i);}}if(bFound){MessageBox(hwnd, TEXT("找到了"), TEXT("提示"), MB_OK);}}break;default:break;}